OK I have been trying to diagnose a issue with my brothers car. 91 targa turbo 7mgte forged rotating assembly .040, stock good working ct26 no play, 3 dp and exhaust.... Hes got about 10k on it and was running like a champ. until.....
Here are the symptoms and what I have tried based on searching the board, trouble codes and my personal knowledge.
The car starts up fine most of the time with real nice healthy start up no hesitation or anything. Then sometimes it acts as if the solenoid isn't even trying to engage not even a "click". Now you put a set of cables on it and boom starts up even though the battery has a full charge and the alternator is in proper working order verified via bench test. You can also push start it no problem every time. I checked the grounds, alternator, batt, the starter is only about 2yrs old and is a oem starter from Toyota dealership, cps wires appear to be good and the clip is nice and tight and clean.
The second and most important problem is the car cannot move at all until its been idling for 10min and is completely warm if you try to move it before its warm even moving the throttle a 1/4 of and inch with no load at all it will bog and try to stall if you let up on the throttle the idle will return and be rock solid as if there are no issues with the car at all!!! The other thing is the redline the car will not for any reason go above 3,000 rpm, in fact at about 2800 rpm it starts to cut or break ignition it falls to idle sometimes stalls other times catches itself and idles rock solid yet again...
First set of codes before I touched the car were: 42 speed sensor, 24 AIT sensor, 31 AFM, 43 starter signal. (the speedo is out too)
Now after checking the above mentioned items and for additional boost/vac leaks I reset the ecu by pulling the efi fuse for 30sec and I got another shot at attempting to drive it down the street. On that attempt it set code 31 which is AFM, AFM circuit , ecu according to trsm. So I swapped it for a lexus afm I had laying around same code so I am guessing the circuit is shorted somewhere? Could that really be whats causing all of this? Note there is no change in anyway with the afm plugged/unplugged which would support the shorted circuit. Yes of course the thing pops out the exhaust and has blueish smoke from and poor combustion obviously....
Fuel pressure is great. I just installed new plugs and wires (and yes 163425) also for shits I swapped coil packs.Tomorrow I will check timing along with the afm circuit, quadruple check the tps calibration and of course the cps. Engine is grounded at the motor mounts, block, head and of course battery.
I am a bit baffled this thing was running great then started this out of no where. After my list of stuff for tomorrow I will get a video if it will help stir up some ideas on what I am overlooking!?!?!? I am already thinking ecu but we will see!!
Here are the symptoms and what I have tried based on searching the board, trouble codes and my personal knowledge.
The car starts up fine most of the time with real nice healthy start up no hesitation or anything. Then sometimes it acts as if the solenoid isn't even trying to engage not even a "click". Now you put a set of cables on it and boom starts up even though the battery has a full charge and the alternator is in proper working order verified via bench test. You can also push start it no problem every time. I checked the grounds, alternator, batt, the starter is only about 2yrs old and is a oem starter from Toyota dealership, cps wires appear to be good and the clip is nice and tight and clean.
The second and most important problem is the car cannot move at all until its been idling for 10min and is completely warm if you try to move it before its warm even moving the throttle a 1/4 of and inch with no load at all it will bog and try to stall if you let up on the throttle the idle will return and be rock solid as if there are no issues with the car at all!!! The other thing is the redline the car will not for any reason go above 3,000 rpm, in fact at about 2800 rpm it starts to cut or break ignition it falls to idle sometimes stalls other times catches itself and idles rock solid yet again...
First set of codes before I touched the car were: 42 speed sensor, 24 AIT sensor, 31 AFM, 43 starter signal. (the speedo is out too)
Now after checking the above mentioned items and for additional boost/vac leaks I reset the ecu by pulling the efi fuse for 30sec and I got another shot at attempting to drive it down the street. On that attempt it set code 31 which is AFM, AFM circuit , ecu according to trsm. So I swapped it for a lexus afm I had laying around same code so I am guessing the circuit is shorted somewhere? Could that really be whats causing all of this? Note there is no change in anyway with the afm plugged/unplugged which would support the shorted circuit. Yes of course the thing pops out the exhaust and has blueish smoke from and poor combustion obviously....
Fuel pressure is great. I just installed new plugs and wires (and yes 163425) also for shits I swapped coil packs.Tomorrow I will check timing along with the afm circuit, quadruple check the tps calibration and of course the cps. Engine is grounded at the motor mounts, block, head and of course battery.
I am a bit baffled this thing was running great then started this out of no where. After my list of stuff for tomorrow I will get a video if it will help stir up some ideas on what I am overlooking!?!?!? I am already thinking ecu but we will see!!
